Hi NS, You won't have to adjust the secondary very often, but to make it easier when you do I suggest that you get rid of those secondary screws and replace them with hand operated ones. It makes the job infinately better and there's no tool to drop on the primary mirror.
I would recommend a Cheshire/sight tube, Bintel sell them for $69 and there made by Orion.
If it helps I'll post the instructions that came with the collimator.
Here is a image of the new knobs. Cheers, John.
